Simple example to understand try and catch

<?php

    class EmptyName extends Exception
    {
        private $_nameError;

        public function __construct( $message )
        {
            $this->_nameError = $message;
        }

        public function getNameError()
        {
            return $this->_nameError;
        }
    }

    class EmptyEmail extends Exception
    {
        private $_emailError;

        public function __construct( $message )
        {
            $this->_emailError = $message ;
        }

        public function getEmailError()
        {
            return $this->_emailError;
        }
    }

    $name = "someone";
    $email = "";

    try
    {
        if( empty( $name ) )
        {
            throw new EmptyName( "Error name must not be empty" );
        }

        if( empty( $email ) )
        {
            throw new EmptyEmail( "Error email must not be empty" );
        }

        else
        {
            echo "Name : $name" . "<br>" ."Email : $email";
        }
    }

    catch( EmptyName $e )
    {
        echo $e->getNameError();
    }

    catch ( EmptyEmail $e )
    {
        echo $e->getEmailError();
    }

    catch ( Exception $e )
    {
        echo $e->getMessage();
    }

?>